S
M
T
W
T
F
S
28
76°
60°
29
75°
54°
30
N/A
1
78°
52°
2
83°
52°
3
88°
53°
4
91°
53°
5
92°
62°
6
90°
62°
7
91°
63°
8
92°
64°
9
93°
63°
10
92°
64°
11
94°
64°
12
94°
65°
13
98°
66°
14
95°
64°
15
94°
67°
16
94°
66°
17
95°
65°
18
94°
66°
19
94°
67°
20
95°
68°
21
96°
68°
22
94°
67°
23
94°
66°
24
93°
63°
25
91°
63°
26
91°
64°
27
93°
65°
28
94°
66°
29
95°
66°
30
96°
67°
31
97°
68°
1
96°
67°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
July Weather in Castaic
Castaic's July 2026 forecast shows daily high temperatures ranging from 78° to 98°, with overnight lows between 52° and 68°. The average high for July is 93° with an average low of 64°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how July weather will actually feel in Castaic. See also: August | September | October.
